Firefighters say in an incident narrative that the car fire appeared to be extinguished but then reignited, leading them to dismantle the front end of the vehicle. They used a jack to lift the vehicle and a circular saw to gain access to the burning battery pack.

Shares of Palo Alto-based Tesla Motors Inc. fell more than 6 percent Wednesday after an Internet video showed flames spewing from the vehicle.

The driver said he believes he struck debris on the road. Tesla says every indication is that the fire was a result of damage caused by that collision.

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